.page-about {
  --tl-rail-left: 11px;
  --tl-accent: var(--flame);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 5vw, 52px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(22px, 4vw, 38px);
}

.page-about .about-hero__lead .headline {
  margin: 10px 0 0;
}

.page-about .about-hero__lead .lede {
  margin-top: 18px;
  max-width: 60ch;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .fact {
  background: var(--ink);
  padding: 14px 14px 16px;
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .fact--flame .fact__num {
  color: var(--flame);
}

.page-about .fact--ice .fact__num {
  color: var(--ice);
}

.page-about .fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--graphite);
}

.page-about .about-hero__visual {
  position: relative;
  min-height: 280px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(120% 88% at 50% 122%, rgba(255, 75, 31, 0.5) 0%, rgba(255, 75, 31, 0) 58%),
    radial-gradient(150% 100% at 50% 132%, rgba(255, 138, 61, 0.32) 0%, rgba(255, 138, 61, 0) 72%),
    linear-gradient(180deg, rgba(47, 211, 232, 0.14) 0%, rgba(47, 211, 232, 0) 46%),
    var(--layer);
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to right, rgba(244, 241, 234, 0.09) 0 1px, transparent 1px 12.5%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 38%, #000 72%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 38%, #000 72%, transparent 100%);
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -48%;
  width: 128%;
  aspect-ratio: 1 / 1;
  transform: translateX(-50%);
  border-radius: 50%;
  border: 1px solid rgba(255, 75, 31, 0.5);
  box-shadow: inset 0 0 0 1px rgba(47, 211, 232, 0.22);
}

.page-about .about-hero__spark {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 16px 4px rgba(255, 138, 61, 0.5);
}

.page-about .about-hero__spark--a {
  left: 22%;
  bottom: 26%;
}

.page-about .about-hero__spark--b {
  left: 58%;
  bottom: 38%;
  background: var(--ice);
  box-shadow: 0 0 16px 4px rgba(47, 211, 232, 0.45);
}

.page-about .about-hero__spark--c {
  left: 76%;
  bottom: 18%;
  width: 4px;
  height: 4px;
}

.page-about .about-hero__label {
  position: absolute;
  left: 20px;
  top: 18px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--graphite);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__head {
  max-width: 62ch;
}

.page-about .about-timeline__head .headline {
  margin: 10px 0 0;
}

.page-about .about-timeline__head .lede {
  margin-top: 16px;
}

.page-about .about-timeline__figure {
  margin: clamp(26px, 4vw, 44px) 0 clamp(34px, 5vw, 58px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: var(--tl-rail-left);
  top: 10px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--flame) 0%, var(--amber) 32%, var(--ice) 68%, rgba(244, 241, 234, 0.08) 100%);
}

.page-about .tl__item {
  --tl-accent: var(--flame);
  position: relative;
  padding: 0 0 38px 40px;
}

.page-about .tl__item--ice {
  --tl-accent: var(--ice);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--tl-accent);
  box-shadow: 0 0 0 5px var(--ink);
}

.page-about .tl__mark {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--tl-accent);
}

.page-about .tl__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--graphite);
}

.page-about .tl__title {
  margin: 6px 0 10px;
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--bone);
  transition: color 0.25s var(--ease);
}

.page-about .tl__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.82);
  max-width: 66ch;
}

.page-about .tl__note {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--tl-accent);
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
  max-width: 60ch;
}

.page-about .tl__item:hover .tl__title,
.page-about .tl__item:focus-within .tl__title {
  color: var(--tl-accent);
}

/* ---------- 分隔线稿 ---------- */
.page-about .about-seam {
  color: var(--graphite);
  opacity: 0.5;
  max-width: var(--shell);
  margin: clamp(8px, 2vw, 20px) auto;
  padding: 0 var(--gutter);
}

.page-about .about-seam svg {
  display: block;
  width: 100%;
  height: 42px;
}

/* ---------- 校订流程 ---------- */
.page-about .about-system__head {
  max-width: 62ch;
}

.page-about .about-system__head .headline {
  margin: 10px 0 0;
}

.page-about .about-system__head .lede {
  margin-top: 16px;
}

.page-about .flow {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .flow__step {
  background: var(--ink);
  padding: 22px 20px 26px;
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--flame);
}

.page-about .flow__step--amber .flow__num {
  color: var(--amber);
}

.page-about .flow__step--ice .flow__num {
  color: var(--ice);
}

.page-about .flow__title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 234, 0.74);
}

.page-about .about-system__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

/* ---------- 多端与访问 ---------- */
.page-about .about-multi__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-multi__lead .headline {
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .about-multi__lead .lede {
  margin-top: 16px;
  max-width: 58ch;
}

.page-about .about-multi__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.8);
  max-width: 58ch;
}

.page-about .about-multi__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  align-content: start;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-multi__stats .stat {
  background: var(--layer);
  padding: 18px 16px 20px;
}

.page-about .about-multi__foot {
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 本地运营 ---------- */
.page-about .about-local .headline {
  margin: 10px 0 0;
  max-width: 22ch;
}

.page-about .about-local .lede {
  margin-top: 16px;
}

.page-about .about-local__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-local__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__visual {
    min-height: 360px;
  }

  .page-about .about-multi__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: stretch;
  }

  .page-about .about-hero__visual {
    min-height: 100%;
  }

  .page-about .about-multi__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-multi__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .tl::before {
    left: 131px;
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 100px minmax(0, 1fr);
    column-gap: 52px;
    padding: 0 0 54px 0;
  }

  .page-about .tl__item::before {
    left: 124px;
    top: 12px;
  }

  .page-about .tl__mark {
    margin: 0;
    padding-top: 4px;
    text-align: right;
    font-size: clamp(30px, 3.4vw, 40px);
  }
}

@media (max-width: 520px) {
  .page-about .flow__step {
    padding: 18px 16px 22px;
  }

  .page-about .tl__item {
    padding-left: 34px;
  }
}
<<<END>>>